JCL Specials

Symbols used in JCL datasets
1. && - Temporary Datasets
2. & -  Symbolic parameters in procedures
3. * - Referbacks

Temp Datasets
1. Without DSN - //DATA1 DD
2. With DSN    - //DATA2 DD DSN=&&tempdata

Special Programs
1. IGYCRCTL - Compilation
2. IEWL     - Link/Edit 
3. DSNHPC   - Precompile
4. IKJEFT01 - Bind

System Programs
1. IEF* - Program produced by scheduler group
2. IEB* - Dataset utility programs
3. IEH* - System utility programs
4. IEW* - Linkage/Loading programs